Germany's postal service Deutsche Post is using the Google Maps API so that their customers can find the locations of post offices, letter boxes, ATM's and stamp dispensers.
To search the map just enter your location and select which service you wish to view. The results will then be displayed on the map.
Depending on the service you have chosen to view the map markers will display further information. For example, post office opening hours are displayed or, if you choose to view postboxes, you can view the collection times.